(19)
(11) EP 0 516 064 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.04.1993 Bulletin 1993/14

(43) Date of publication A2:
02.12.1992 Bulletin 1992/49

(21) Application number: 92108878.7

(22) Date of filing: 26.05.1992
(51) International Patent Classification (IPC)5: G02F 1/225, G02F 1/313, G02B 6/12
(84) Designated Contracting States:
CH DE FR GB IT LI SE

(30) Priority: 29.05.1991 US 706911

(71) Applicant: CRYSTAL TECHNOLOGY, Inc.
Palo Alto, California 94303 (US)

(72) Inventor:
  • Skeie, Halvor
    San Jose, California 95117 (US)

(74) Representative: Fuchs, Franz-Josef, Dr.-Ing. 
Postfach 22 13 17
D-80503 München
D-80503 München (DE)


(56) References cited: : 
   
       


    (54) Integrated optical modulator and method of providing a linearly modulated light signal


    (57) A Y-branch type first interferometric modulator, and a coupler structure type second interferometric modulator are connected in cascade. The levels of DC bias voltages applied to the first and second interferometric modulators, respectively, are adjusted for maximizing the linearity of a modulated output light signal. The configuration of input and output coupler structures of the second interferometric modulator are predetermined for also contributing to maximizing the linearity of the output signal.






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